AirHint found the following cheapest return flights from Sofia (SOF) to Skiathos (JSI) in September 2025 (see full year).

Return flights

03 Sep - 17 Sep	Ryanair	direct
03 Sep - 20 Sep	Ryanair	direct
17 Sep - 20 Sep	Ryanair	direct
24 Sep - 27 Sep	Ryanair	direct
13 Sep - 17 Sep	Ryanair	direct
10 Sep - 20 Sep	Ryanair	direct
03 Sep - 06 Sep	Ryanair	direct
03 Sep - 21 Sep	Ryanair
17 Sep - 24 Sep	Ryanair	direct
17 Sep - 21 Sep	Ryanair
27 Sep - 04 Oct	Ryanair
29 Sep - 06 Oct	Aegean Airlines

Also check the deals for one-way flights from Sofia to Skiathos in September.

The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

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Cheapest return flights from Sofia to Skiathos in September from 74€

Return flights